Positive/ˈpɑːzətɪv/ Definition 1 of 6Pro Tip 1/2Certainty Strength Used to express no doubt about a situation or identification. The alibi was positive, putting him miles away from the crime. Pro Tip 2/2Enhancing Adverb 'Positively' as an adverb to emphasize certainty. The witnesses are positively sure of their testimonies.